ZST (.zst)
.zst file signature | application/zstd
ZST is a compressed file format based on Zstandard, a lossless compression algorithm originally developed by Facebook and now maintained as an open standard by its community and successors. It is used to reduce storage size and transfer time for archives, software packages, backups, and other data files, often in streaming and high-performance applications. The format is generally safe, though decompression of untrusted files can consume significant resources or trigger decompression bombs.
Magic Bytes
Offset 0
28 B5 2F FD
Sources: Wikipedia
Extension
.zst
MIME Type
application/zstd
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .zst files in Python
def is_zst(file_path: str) -> bool:
"""Check if file is a valid ZST by magic bytes."""
signature = bytes([0x28, 0xB5, 0x2F, 0xFD])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .zst files in Node.js
function isZST(buffer: Buffer): boolean {
const signature = Buffer.from([0x28, 0xB5, 0x2F, 0xFD]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .zst files in Go
func IsZST(data []byte) bool {
signature := []byte{0x28, 0xB5, 0x2F, 0xFD}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/zst
curl https://filesignature.org/api/v1/zst
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .zst file?
A .zst file is identified by the magic bytes 28 B5 2F FD at byte offset 0. ZST is a compressed file format based on Zstandard, a lossless compression algorithm originally developed by Facebook and now maintained as an open standard by its community and successors. It is used to reduce storage size and transfer time for archives, software packages, backups, and other data files, often in streaming and high-performance applications. The format is generally safe, though decompression of untrusted files can consume significant resources or trigger decompression bombs.
What are the magic bytes for .zst files?
The magic bytes for ZST files are 28 B5 2F FD at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .zst file?
To validate a .zst file, read the first bytes of the file and compare them against the known magic bytes (28 B5 2F FD) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .zst files?
The primary MIME type for .zst files is application/zstd.
Is it safe to open .zst files?
ZST (.zst) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.